why would a new rotr change your offset? your offset is determined in your wheels no the rotors.
also that kit is 3000 bucks! pahhhhhh <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/notify.gif" border="0" valign="absmiddle" alt=':notify:'> just grab some z32 calipers rotors and steel lines and your done. alottttttttttttttt cheaper i did my whole brake upgrade for around 300 bucks